I order a 7-5/8" Twister hat i had tried on at another store. The 7-5/8" i ordered was much to large. I exchange the hat for a 7-1/2" Twister hat. Almost as large as the 7-5/8" hat. Apparently, Twister hats are not true to size and must be tried on in a store before purchasing. I returned the 7-1/2" for a refund. If I knew a 7-3/8" Twister would work I would have exchanged again. But, not worth the risk and shipping cost. Refund and Exchanges have been helpful to work with.